I always wanted to see a cemetery level, either as part of a bigger level or as it's own, would be fun to destroy and battle on. A plane carrier would be interesting too, small and doesn't offer too much room to battle/maneuver, maybe it should be a boss arena with a time limit (Ship is sinking so you gotta be fast)An airport that's massive and barren... with the usual passenger plane that might land on top of or be able to cause massive damage. A nuclear plant would offer interesting hazards too, a small enterable sewer/control rooms with the risk of radioactive leaks .

And maybe... hell?I know it could be a bit too much for TM but the last game made it clear that calypso was the Devil, so it would make sense at some level... not to mention it could be criminally cool if done right.

I always imagined an artic level with a metal dome on the center. And when you finished all the opponents the dome would open and a submaarine boss would rise from the waters. Too bad that the submarine couldn't be unlocked to use in other levels because it's a submarine. And would be tricky to make the battle interesting since the sub can't move, but it can go underwater and have shields.